Melting pot



. 5, 1939. N. LE TER- 21 2403 MELTING Po'r Filed April 7, 1937 INVENTQR.

BY 710172471 i625 er 5%. Ma 9 ATTORNEY?- Patented Dec. 1 939 UNITEDSTATES may;

PATENT oFFicsf 1 Claim. (01. 22-70) The present invention-relates to anew and improved construction for a melting pot best adapted to be usedin pressure casting machines.

The general object andnatur'e or my invention is to provide aconstruction wherein those parts of the melting pot which are subjectedto the greatest stress and severest usage are removable and replaceableso that the entire melting potneed not be discarded in the event thatone or more of the parts subjected to the severest con-' ditions ofusage should fail.

Briefly outlined, my invention comprises a metal pressure castingcylinder and a pressure delivery conduit or gooseneck, both of which aremade separable from the melting pot propeiy'but are in normal operationadapted to be mounted in the interior of such melting pot. In additionto the advantages heretofore outlined, the construction embodying theprinciple of my invention possesses the further advantage in that thewalls of the melting pot are of uniform thickness throughout theirhorizontal cross sections thereby insuring uniform transmission of heatto the metal within the pot and eliminating the presence of any possiblecold spots in the walls oi the melting pot due to irregularities andthickness.

My invention also provides means for transmitting force directed againstthe discharge end of the separable gooseneck to the rim of the scrlptionset forth in detail certain structure em-- bodying the invention, suchdisclosed'means con stituting, however, but one or various structuralforms in which the principle of the invention may be used.

In said annexed. drawing:

Fig. l is a top plan View of a. melting not contion; Fig. 2 is avertical cross section taken substantially along line 22 of Fig. l; andFig. 3 is a vertical cross section taken substantially along line 3-3 ofFig. l.

Now referring more particularly to the drawing, there is shown therein amelting poti having a rim flange 2. A pressure conduit or gooseneci; 3having a central passage 3 has a discharge end 5 adjacent the rim of themelting pot i and an 5: enlarged annular reed emit adapted to rest onmelting pot instead of against the bottom of thestructed according tothe principle of my inventhe bottom of the melting pot l and to supportthe pressure cylinder 1. A plunger 8 is adapted to reciprocate in thecentral bore IQ of the cylinder 1. Inlet passages 9 lead from themelting pot I into the central bore Ill of the cylinder I. 5

The central bore i0 is enlarged as indicated at H and decreased asindicated at H to a diameter equal to that of the passage 4 in thegooseneclr 3. The meeting faces of the annular end 8 of the gooseneck 3and of the cylinder 1, as indicated at 10 H, are finished, close fittingsurfaces; and a pro jecting boss M, with tapered sides on the cylinder1, extends into a correspondingly shaped recess in the top of thegooseneck feed end 6. The latter in turn has an annular bearing surfaceon 15 its bottom and a central projecting boss l5 fitting in the bottomof the melting pot i. Thus the projections Hi and it serve as means notonly for properly aligning and locating the gooseneck portion d and thecylinder 5, but also the projection 20 M, together with the finishedmeeting surfaces it, serves as means for sealing the interior of thecylinder i and the gooseneck 3 to prevent leakage of molten metal whensubjected to pressure.

Projections or lugs i'l extend from the bottom as of the melting pot ito a point near its top and are adapted to be threadably engaged by thestuds it which in turn hold the clamping members is in place. As willbest be seen from Fig. 3, the clamping members 19 bear against the rim 2or so the melting pot i and against the top-of the cylinder "i andthereby clamp the goosenech 3 and cylinder 7 in positionin the interiorof the melting pot.

The rim 2 of the melting pot has a recem 2d for the reception of thedischarge end d of the gooseneck 3. A groove at is provided inthe recessit and is for the purpose of receiving a packing or sealing materialsuch as fire clay so that the upper end of the gooseneck 3 can be sealedso as to pre- 4g vent leakage of liquid metal through therecess 26. Alug 22 an the discharge end 5 of the gooseneck 3 carries thethreadedstuds 83 which in turn are adapted to abut against the l 2 9 up=standing on the rim 2. Since the melting pot is 45 carried by asupporting frame and the discharge end 5 of the gooseneck 3 is connectedto a mold, such as indicated in the apparatus shown in my copendingapplication Serial No. 66,551, filed Mar. I 2, 1936, some force will beexerted against such an discharge end o. Hence the abutment meanscomprising the lugs 22, 24 and the studs 23, pre vent such force orpressure from being transmitted through the intermediate portion of thegcosenec'r; a to the bottom of the melting pot i. as

The studs 23 of course provide means for adjust]- ably regulating theabutment point of the end of the gooseneck 3 with respect to themeltingpot the liquid level of the metal in the melting pot can normallyextend as high as possible in the interior 4 of the gooseneck 3, thuseliminating as much air as possible therefrom. As will be seen from Fig.2, the liquid level of the metal in the melting pot I is maintainedsubstantially at the line L, L. Leakage of metal out through the opening20 is of course prevented by the fire clay packing materialin the groove2|. 1

Other modes of applying the principle of my invention may be employedinstead of the one explained, change being made as regards the structureherein disclosed, provided the means stated by the following claim orthe equivalent of such stated means be employed.

I therefore particularly point out and distinct- 1y claim as myinvention:

In a melting pot the combination of a vertical pressure cylinder and apressure delivery conduit, bothseparable from each other and from saidmelting pot, said conduit being entirely supported at its feedend by thebottom of said melting pot and having its discharge end directlysupported by the rim of said melting pot, said cylinder being entirelysupported and superimposed upon said feed end of said conduit,interfitting projections and recesses on said cylinder, on said feed endof said conduit and on said melting pot respectively, for locating andaligning them in assembled position, said-recesses and projections beingin alignment with each other and located centrally of said cylinder, ofsaid feed end of said conduit, and of the bottom of said melting pot,and means for clamping said cylinder and said conduit to said meltingpot in such position, the

entire cross sectional area of said cylinder and said feed end of saidconduit being substantially the same.

NATHAN LE TER.

